Iron electrode.



MAX RQLOFF, F HAGEN, GERMANY.

IRON ELECTRODE.

No Drawing.

Specification of Letters Patent.

ratented Sept. 213,11909.

Application filed October 28, 1904:. Serial No; 230,439.

To all whom it may concern: I

Be it known that I, MAX lionorr, residing in 21 Buscheystrasse, Hagen, in the Province of \Vestphalia, Germany, a subject of the King of Prussia, have invented certain new and useful improven'ients in Iron Electrodes, of which the following ispi l tion.

The present invention relates to iron electrodes For alkaline accumulators and to-their production.

For the negative elect rodes of alkaline accunmlators it is of advantage to employ a specially finely divided iron which is re- 'duced in caustic potash from its oxygen compounds. Experiment, however, shows that all the oxids o1 iroi are not reduced by the electric current. In the majority of cases one has to deal with a mixture of iron oxids and it happens that. such iron oxids as are reducible in a pure condition cannot be reduced at. all, or can only be partially re-- duced, in the mixture because the non-reduced oxids do not. conduct the electric current and consequently place the reducible oxid, which is in the mixture out of contact. with the conductors of the electrode supplying the current. Common fm-gescalos or ha nn'iersla belongs to these mixtures, in its 39 raw condition it. being capable of being only slightly employed. The same contains the three iron compounds, t'errous oxid Fet), ferric oxid Fe t), and magnetic oxid Fe t) Of these compounds the first two are with diiliculty reducible; 0n the other hand the distinguished.trom the other two compounds by the fact that it is attracted by magnets whereas the two others are not inllucnccd by magnets. 7

According to the present invention iron electrodes for alkaline accumulators are consequently formed by first; crushing or pul- 'erizing common forge-scales or hammer-sla to an exceedingly fine powder, the coarser further trilurated. This exceedingly line. powdcr is divided into two portions by the aid of steel magnets. electro-imignets or solenoids so that: one portion contains only powder the separate particles of which are attracted by magnets. \Vith this powdcr which may be compressed into cakes, snilably by means of presses, the hollow spaces of iron grids or pockets are filled, those grids or pockets bein g such as are commonly employed as electrodes for such accumulators. The (lGtltOtlts are then suspended in an alkaline lye and the electric current is allowed to operate. By means of the electric current the powder is reduced to very effect.-

lvc iron-sponge What. I claim is:-

alkaline act'aimulators consisting of magnet ic oxid 'o't iron n'nigrnctically derived l'roi. forge-scale and free from non-magnetic ingredients ol the scale.

In witness whereof, I have hereunto signed my name in the presence ol' two su| scribing witnesses.

- MAX ROLUl l Witnesses:

O'r'ro Komo, i A. Rrrrnnsn/ms.

powder being" separated otl by a sieve and Active material for negative pole plates of 

